2 Samuel 17:21-23

²¹After they had departed, they came up out of the well and went and told king David; and they said to David, “Arise and pass quickly over the water; for thus has Ahithophel counseled against you.”

²²Then David arose, and all the people who were with him, and they passed over the Jordan. By the morning light there lacked not one of them who had not gone over the Jordan.

²³When Ahithophel saw that his counsel was not followed, he saddled his donkey, arose, and went home to his city, set his house in order, and hanged himself; and he died, and was buried in the tomb of his father.